MediaWiki:Citizen.css

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/* All CSS here will be loaded for users of the Citizen skin */

body {
  background-image: url("https://www.evernyllawakened.wiki/images/b/b5/EvernyllBackground.png");
  min-height: 500px;
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
<div class="hf-nsheader" style=
background-image: url(https://www.evernyllawakened.wiki/images/e/e2/HeaderSky.png);
background-attachment: local;
background-position: relative;
background-repeat: no-repeat;
background-size: contain;
>
</div>